erdmini — Free Browser-Based ERD Tool
erdmini is a free, open-source Entity-Relationship Diagram (ERD) tool that runs entirely in your browser. Design database schemas visually with drag-and-drop, then export DDL for MySQL, PostgreSQL, MariaDB, and MSSQL.
Key Features
- Visual drag-and-drop ERD canvas with zoom, pan, and minimap
- Table, column, foreign key, and index management
- DDL export/import for MySQL, PostgreSQL, MariaDB, MSSQL
- Diagram export to Mermaid, PlantUML, SVG, PNG
- Auto-layout: grid, hierarchical, and radial algorithms
- Undo/redo, schema linting, and schema diff
- URL-based schema sharing — no server needed
- 4 themes with dark mode, 4 languages (EN/KO/JA/ZH)
Frequently Asked Questions
- Is erdmini free?
- Yes. erdmini is completely free and open-source. No sign-up or payment required.
- What databases does erdmini support?
- erdmini exports DDL for MySQL, PostgreSQL, MariaDB, and Microsoft SQL Server (MSSQL).
- Does erdmini require a server?
- No. erdmini runs entirely in the browser using local storage. An optional server mode with SQLite, Docker, and real-time collaboration is also available.
- Can I share my ERD with others?
- Yes. You can share schemas via URL (compressed, no server needed) or export as DDL, Mermaid, PlantUML, SVG, or PNG.
Please enable JavaScript to use erdmini.
